A series of Osprey Platforms with nest images from the Edwin B. Forsythe NWR in Oceanville, NJ. I was using a Tamron 150-600mm lens with a 2X teleconverter to get closer to the Osprey Platforms. Then cropped in a little for a tighter composition. You can see the nests are not the neatest or cleanest when you are looking that close, but are still interesting. Also it is interesting when an Osprey sees you photographing them they really stare you down! The Canon R, even with a 2X teleconverter on a Tamron 150-600mm auto focuses quite quickly and right on focus. The Canon R will autofocus even with stacked 2x & 1.4X (or 1.7x) teleconverters. Did not try stacking 2X Teleconverters. I have also found that when stacking teleconverters I usually stop down a little more to help with sharpness.